HI Running the LPRO from a supply below 19 volts is a good idea. As you raise the voltage into the unit, a lot of the energy simply goes into heat. Not a good thing when you have a marginal heatsink in the first place.
Bob On Feb 27, 2010, at 8:56 PM, Ed Palmer wrote: > What else is going to be in the rack? If your 1U enclosure is packed in > tight between other devices there might be no cooling at all. You might need > a fan to move some air. > > I don't know if you can find something like this, but I scavenged heat sinks > from an old Compaq DL760 server that might fit your situation. Here's what > the heat sink looks like. The aluminum plate is about 1/4" (6.4 mm) thick. > Notice the heat pipes. > > > > Here's what it looks like on the LPRO. You'll have to drill holes in the > plate to match the LPRO. > > > > It's not perfect, but it certainly does the job - particularly if you had a > fan blowing through the fins. The total height is about 1.75" (45 mm). > > But remember, the more you cool the LPRO, the more power it will draw to keep > itself warm so you don't want to overdo the cooling. > > Ed > > Paul Boven wrote: >> Dear time-nuts, >> >> I've just bought a used LPRO-101 which should get a permanent home inside an >> instrument rack. I've also found a very nice 1U high metal case, and a >> fitting 24V 1U power supply - leaving plenty of room for a distribution amp >> and a microcontroller to log things like lamp and Xtal voltage. >> >> The rackmount enclosure is 1U high, and seems to be made of 1mm thick >> galvanized steel. Would that make a good enough baseplate for the LPRO? >> Would I need to do anything to improve the thermal contact between the >> rubidium oscillator and the baseplate, and if so, any recommendations on >> what to use there? The LPRO "User's guide and integration guidelines" >> recommend 2degC/W thermal resistance (for up to 50degC ambient), and using >> some special thermal tape that will probably be very hard to get at these >> days. If any of you has already put something like this together, I'd be >> very interested in your suggestions. >> >> Regards, Paul Boven - PE1NUT >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
